Amps
[Top] [All Lists]

[AMPS] Sucking instead of Blowing (was - This guy is gotta be kidding!)

To: <amps@contesting.com>
Subject: [AMPS] Sucking instead of Blowing (was - This guy is gotta be kidding!)
From: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK)
Date: Mon, 28 May 2001 09:11:24 +0100
2 wrote:
>>Unfortunately that isn't at all relevant to forced-air cooling, where
>>the airflow is very turbulent and the flow pattern is quite different. 
>>
>â?¬  fasten seatbelts
>
>>Air is blasted at the upstream side of the tube, cooling it well, but
>>the flow breaks away from the surface half-way around to form a
>>turbulent wake. 
>
>â?¬  Not with the quiet, slow speed fan in a SB-220, Ian..
>
All practical cooling fans create turbulence. It's easy to check with a
streamer of smoke.

>>The downstream side is only cooled by eddies in the
>>wake, and there may even be negative pressure on the opposite side. 
>>
>>There is absolutely no doubt that cooling is less good on the downstream
>>side. 
>
>â?¬  The  colour of the ink on the 3-500Z glass does not indicate this. 
>
Thank you - that's the information I was asking for. Can you confirm
that the ink is on the opposite side from the fan?

> >The only questions are: how much less good, and does it matter?
>>That's why I was looking for separate evidence whether the color of the
>>markings is dependent on the orientation of the tube.
>>
>â?¬  Denial of reality - the greatest glitch in the human psyche. Alas. 

How very true for all of us. That's why I was asking for simple
information about what the reality IS, in the SB-220 and the L4-B.


73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
                           http://www.ifwtech.com/g3sek

--
FAQ on WWW:               http://www.contesting.com/FAQ/amps
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com


<Prev in Thread] Current Thread [Next in Thread>